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RF Frequency Response of Photoconductive Samplers

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3 Author(s)
Jean-Fran├žois Roux ; Institut de Microélectronique Electromagnétisme et Photonique et le Laboratoire d'Hyperfréquences et de Caractérisation Laboratory, site du Bourget du Lac, Unité Mixte de Recherche 5130 du Centre National de la Recherche Scientifique, Université de Savoie, Le Bourget du Lac, Paris, France ; Jean-Marie Delord ; Jean-Louis Coutaz

We derive the microwave bandwidth of ultrafast optoelectronic samplers based on photoconducting switches, using a simple analytical model. The validity of this model is checked by measuring the bandwidth of semi-intrinsic and low-temperature-grown GaAs photoswitches. The bandwidth of such devices is limited by the response time of both the semiconductor material and the electrical circuit. The devices behave as low-pass filters exhibiting a -60 dB/decade slope.

Published in:

IEEE Journal of Quantum Electronics  (Volume:47 ,  Issue: 2 )